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Warrants (Tables) | 12 Months Ended
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Dec. 31, 2018
Other Liabilities Disclosure [Abstract] |
Schedule of Warrants Issued and Outstanding | Warrants issued and outstanding at December 31, 2018 are as follows(in thousands, except share and per share data):
|  | Date |  | Number of Shares Underlying Warrants |  | Price per Share |  | Fair Value |
Warrants to purchase |  | Issuance |  | Expiration |  |  |
Common stock |  | 3/1/2017 |  | 3/1/2027 | [a] | 1,388 |  |  | 5.94 |  |  | $ | 5 |  | [b]
Common stock |  | 7/19/2013 |  | 7/22/2023 | [a] | 32,983 |  |  | 9.10 |  |  | $ | 122 |  | [b]
Common stock |  | 11/26/2014 |  | 11/26/2024 | [a] | 6,680 |  |  | 16.47 |  |  | $ | 49 |  | [b]
Common stock |  | 10/20/2015 |  | 10/20/2025 | [a] | 41,650 |  |  | 16.47 |  |  | $ | 396 |  | [c]
Common stock |  | 11/9/2015 |  | 11/9/2025 | [a] | 25,709 |  |  | 16.47 |  |  | $ | 244 |  | [c]
Common stock |  | 12/22/2016 |  | 12/22/2026 | [a] | 9,712 |  |  | 10.03 |  |  | $ | 45 |  | [c]
Total outstanding common stock warrants |  |  |  |  |  | 118,122 |  |  |  |  |
[a] | Common stock warrants will remain outstanding until exercised by the holder.
[b] | Fair value at the date of issuance.
[c] | Fair value at the date of conversion from redeemable convertible preferred stock to common stock warrants in conjunction with the IPO on October 16, 2018.
Warrants issued and outstanding at December 31, 2017 are as follows (in thousands, except share and per share data):
|  | Series |  | Date |  | Number of Shares Underlying Warrants |  | Price per Share |  | Fair Value |
Warrants to purchase |  |  | Issuance |  | Expiration |  |  |
Common stock |  |  |  | 7/19/2013 |  | 7/22/2023 | [a] | 101,010 |  | $ | 3.96 |  |  | $ | 244 |  | [b]
Common stock |  |  |  | 11/26/2014 |  | 11/26/2024 | [a] | 21,928 |  | $ | 3.42 |  |  | $ | 47 |  | [b]
Common stock |  |  |  | 3/1/2017 |  | 3/1/2027 | [a] | 1,388 |  | $ | 5.94 |  |  | $ | 5 |  | [b]
Total common stock warrants |  |  |  |  |  |  |  | 124,326 |  |  |  |  |
Redeemable convertible preferred stock |  | Series 5 |  | 7/1/2012 |  | 7/25/2019 | [d] | 54,917 |  | $ | 9.10 |  |  | $ | 255 |  | [c]
Redeemable convertible preferred stock |  | Series 5 |  | 7/19/2013 |  | 7/22/2023 | [e] | 21,989 |  | $ | 9.10 |  |  | $ | 122 |  | [c]
Redeemable convertible preferred stock |  | Series 6 |  | 11/26/2014 |  | 11/26/2024 | [e] | 6,310 |  | $ | 16.47 |  |  | $ | 49 |  | [c]
Redeemable convertible preferred stock |  | Series 6 |  | 10/20/2015 |  | 10/20/2025 | [e] | 39,339 |  | $ | 16.47 |  |  | $ | 396 |  | [c]
Redeemable convertible preferred stock |  | Series 6 |  | 11/9/2015 |  | 11/9/2025 | [e] | 24,283 |  | $ | 16.47 |  |  | $ | 244 |  | [c]
Redeemable convertible preferred stock |  | Series 7 |  | 12/22/2016 |  | 12/22/2026 | [e] | 9,712 |  | $ | 10.03 |  |  | $ | 45 |  | [c]
Total redeemable convertible preferred stock warrants |  |  |  |  |  |  |  | 156,550 |  |  |  |  |
Total outstanding common and redeemable convertible preferred stock warrants |  |  |  |  |  |  |  | 280,876 |  |  |  |  |
[a] | Common stock warrants will remain outstanding until exercised by the holder.
[b] | Fair value at the date of issuance.
[c] | Fair value as of December 31, 2017.
[d] | These warrants will be net exercised immediately upon the closing of the Company’s IPO, or upon a corporate transaction as defined in the Note and Warrant Purchase Agreement dated July 25, 2012.
[e] | Convertible preferred stock warrants will remain outstanding until exercised by the holder and will convert to common stock warrants upon an IPO. The warrants will be exercisable for 10 years from the date of issuance.
Schedule of Weighted-Average Assumptions Used In Computation of Fair Value of Warrants | Weighted-average assumptions used in computation of the fair value of the redeemable convertible preferred stock warrants are summarized in the table below:
|  | Year Ended December 31,
|  | 2018 |  | 2017
Remaining contractual term (in years) |  | 4.9 |  |  | 5.3 |
Expected volatility |  | 53.89 | % |  | 59.06 | %
Risk-free interest rate |  | 2.62 | % |  | 2.16 | %
Dividend yield |  | — | % |  | — | %

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 + Details
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